A000073: Arduino Uno SMD R3


The Arduino Uno SMD R3 is a microcontroller board based on the ATmega328. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started. The Uno differs from all preceding boards in that it does not use the FTDI USB-to-serial driver chip.

Additional features coming with the R3 version are:

  • ATmega16U2 instead 8U2 as USB-to-Serial converter.

  • 1.0 pinout: added SDA and SCL pins for TWI communication placed near to the AREF pin and two other new pins placed near to the RESET pin, the IOREF that allow the shields to adapt to the voltage provided from the board and the second one is a not connected pin, that is reserved for future purposes.

  • Stronger RESET circuit.


Manufacturer Arduino
Category Open Source MCU Platforms
Eval Board Part Number 1050-1041-ND
Eval Board Supplier Arduino
IDE Arduino
Speed 16 MHz
Bits 8 Bit
Memory, Flash/RAM 32 kB / 2 kB
Digital I/O 14 I/O, 6 PWM
Interface I²C x1
SPI x1
Analog Outputs (DACs) 6 x 8 Bit
Analog Inputs (ADCs) 6 x 10 Bit
DMA Channels 0
Features Arduino UNO Form Factor Compatible
Over Current Protection
Radio -
Interrupt Pins 2
I/O Voltage 5 V
Voltage In 7 ~ 12 V
Touch Sensing Pins 0
Program/Debug Interface ISP Header
USB Type-B
Area 3658² mm, 5.67² In
Main I.C. Base Part ATmega328P
Design Author Arduino
Date Created By Author
Date Added To Library 2019-05

Eval Board

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